Abstract
Finite element analysis is performed on four reinforced concrete coupling beams of intermediate length using 2-D plane stress elements, under monotonic load up to failure. The model is verified using the results from (Nabilah and Koh in KSCE J Civil Eng 21:2807–2813, 2017). The bond-slip interface for the longitudinal reinforcement is modeled in the finite element, as it is found that it better predicts the load-deformation behavior compared to perfect bond. The comparison between finite element analysis and the experiment found that the model is able to predict the overall behavior of the structure, especially the maximum load capacity. The maximum deformation and the shear deformation from the finite element analysis are found to be underestimated, due to the inability of the model to predict shear deformation accurately. Flexural deformation (due to flexure and slip) is found to be well predicted, as the bond-slip behavior is modeled in the analysis. Generally, the shear deformation and slip are found to be significant in the intermediate length coupling beam and should not be ignored in the analysis. Finally, the effective stiffness prediction using finite element analysis is found to be overestimated and should be determined instead using existing equations.
Highlights
The behavior of beams is largely influenced by its span to depth ratio
5.1 Load‐Deformation Analysis Figure 6 compares the result obtained from the experimental work with the result from the numerical analysis with and without considering the bond-slip behavior of the longitudinal reinforcement for beam B3.4-2
It can be concluded that bond-slip has to be modeled in finite element analysis to obtain a more accurate result, and the model by fib Model Code for Concrete Structures is found to be adequate for the coupling beams
Summary
The behavior of beams is largely influenced by its span to depth ratio (or aspect ratio, L/d). Most of the models developed could capture the flexural and shear mechanisms rather accurately Another significant factor affecting the deformation capacity (and initial stiffness and ductility) of the coupling beam is the slip of reinforcing bars (Toprak et al 2015; Ding et al 2017). A new finite element model is developed for intermediate length coupling beam to study its overall behavior in terms of maximum shear load and deformation capacities, cracking and failure mode, effective stiffness as well as to investigate the components contributing to the overall deformation of the coupling beams. In the development of the finite element model, emphasis is given on the material constitutive models, bond-slip interactions and element formulation
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